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add a single-threaded version of cas()
author
Simon Marlow
<marlowsd@gmail.com>
Fri, 6 Feb 2009 13:01:30 +0000
(13:01 +0000)
committer
Simon Marlow
<marlowsd@gmail.com>
Fri, 6 Feb 2009 13:01:30 +0000
(13:01 +0000)
includes/SMP.h
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diff --git
a/includes/SMP.h
b/includes/SMP.h
index
5d74667
..
49bc336
100644
(file)
--- a/
includes/SMP.h
+++ b/
includes/SMP.h
@@
-218,6
+218,17
@@
xchg(StgPtr p, StgWord w)
return old;
}
+STATIC_INLINE StgWord
+cas(StgVolatilePtr p, StgWord o, StgWord n)
+{
+ StgWord result;
+ result = *p;
+ if (result == o) {
+ *p = n;
+ }
+ return result;
+}
+
#endif /* !THREADED_RTS */
#endif /* SMP_H */